Refrigerating system



Oct. 25, 1932. A. H. STRONG REFRIGERATING SYSTEM Filed June 6. 1929 2 Sheets-Sheet 1 FIGLI.

Oct. 25, 1932. A. H. STRONG REFRIGERATING SYSTEM Fil ed June 6; 1929 2 Sheets-Shrif. -2

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flow through the apparatus from a reservoir Patented Oct. 25, 1932 UNITED STATES PATENT OFFICE ARCHIB-HUGH STRONG, 0F NORRISTOWN, PENNSYLVANIA., ASSIGNOR TO MASTER DOMESTIC REFRIGERATING COMPANY, INC., OF CONSHOHOCKEN, PENNSYLVANIA, .A CORPORATIONOF NEW YORK REFRIGERATING SYSTEM Application led June 6, 1929. Serial No. 368,791.

My invention is particularly adapted for said'heate'r and valve are rendered alternately use in refrigerating apparatus of the absorpoperative. tion type, and particularly such apparatus My invention includes the various novel in which aqua ammonia is the primary features of construction and arrangement refrigerant. Such apparatus includes a hereinafter more definitely specied. generator in which the ammonia gas is gen- In said drawing; Fig. I is a diagramerated from the water by the application of matic elevation of a refrigerating system, of heat. Ordinarily, at the conclusion of the the absorption type, in conjunction with a heating cycle, the residual Water in the gen- Secondary Cooling system for the main generator is cooled to such a degree as to permit erator.. it to reabsorb the ammonia gas, by the ap- F 1g. His a diagrammatic elevation of said plication of Cooling water which is caused to Secondary @001mg system.

Fig. III is a plan view of the cellular radiato aI Waste outlet. l Although such cooling tor unit which is included in said secondary means may be conveniently employed where system. n I o there is a continual supply of tap water as in In Sald drawlngs; the main refrigerant urban communities; it necessitates piping generator 1 1S arranged JG0 be intermittently connections to the refrigerator structure leadheated by the gas burner 2 e0ntro1led by the ing both from the Supply and to the sewer valve3. Sald generator 1 1s part of a closed or other drainage system and, therefore, is COntalneI OI the mam refrigerant, for inalways costly to install. Moreover, in locali- Stance aqua ammonia V5, and including the ties which are not supplied with Water under -COnCllllt 6 leadlng thI'Ough the rectifier 7 t0 pressure, Such cooling .moans is prohibitive the condenser l0, and the conduit 11 leading in cost for it necessitates the installation not t0 the eYaPOIOI 12 in the insulated refrigonlyv of supply and drainage pipes, but of leratmg inclosure 14, and the conduit 15 leadpumping .means t() circulate the Watelg 111g baCk t0 Sald gEIIGIaOI l, through the Therefore, it is the objectI and effect of my Valve 16- invention to substitute for such water coolsind burner @OntIOl Valve 3 iS arranged t0 ing means -in a refrigerating system of the abbe Opened and Closed thIOugh mechanism in sorption type, of a secondary refrigerating the casing 18 under control of alternately system nclosinga Secondary refrigerant. Ca- BXpallSlble deVlCeS and 20, OI' instance pable of boiling at a low`er temperature than SylphOIl bellOWS; Said bellows 19 being opthe primary refrigerant. .As hereinafter deelratlvely @OnneCted With the thermOStatiC scribed, the secondary refrigerating system bulb 22 which is subject to the temperature includes a liquid trap and a valve between of the main refrigerant, conveniently in the said trap and said generator, whereby, when evaporator 12; so that said burner valve 3 said valve is closed, during the heating cycle is opened to heat the generator 1 when said of the-primary refrigerant, the secondary rebulb 22 reaches a predetermined temperature frigerant, may be held in a liquid state in which is relatively high for the Arefrigerator said trap to exclude such liquid refrigerant 14. Said bellows 20 is operatively connected fronrthe portionof its circuit extending in with the thermostat-ic bulb 23 in the generator said generator, and thus avoid any cooling1 so that said burnervalve 3 is closed when effect upon the generator during the heating said bulb 23 reaches a predetermined temcycle of the latter. In the system chosen perature which is relatively high for the confor illustration; the heating means for the tentsof said generator. j

generator are automatically controlled by As above noted; ordinarily, such a genthermostatic` means, in accordance with the erator l is arranged to be cooled by thevfiow tr-:mperatureV of the main refrigerant, and of tap water with respect thereto when the such `controlling means is operatively con- Aburner valve 3 is closed, but, in accordance Vnected with the trapvalve aforesaid; so that with my invention, in lieu of such ordinary cooling means, I provide a secondary closed circuit including the liquid trap containing a secondary refrigerant 26 capable of boiling at a lower temperature than said main refrigerant 5. Said secondary circuit includes the conduit 28 extending in and out of said generator 1, and the valve 29 between said trap 25 and said generator 1; whereby, when said valve 29 is closed, the secondary refrigerant 26, in a liquid state, is excluded from the portion of its circuit extending in said generator 1. However, said conduit 28 is connected by the conduit 31, with the radiator 32, conveniently of the cellular type having air passageways therethrough and connected by the conduit 33, with said trap 25;

so that when said valve 29 is opened, said n secondary refrigerant 26 may gravitate from said trap 25 through said conduit 29, be boiled by the heat which it absorbs from the i vhot primary refrigerant residue 5 in said generator and, being thus vaporized, may be vrecondensed to the liquid state.`

Said burner valve 3 is cooperatively connected with said secondary refrigerant valve 29, for instance by the link 34, so that when said valve 3 is shut, said valve 29 is opened,

and vice versa. However, anysuitable connecting means may be employed to open said valve 29 whenever 1t is desired to cool the generator 1. v v

Said radiator 32 is conveniently of the cellular type having air passageways 35 therethrough, and the natural convection currents of air through said passageways 35 may be augmented to any desired degree by providing said radiator 32 with the stack 37, the upper end of which is open to the atmosphere.

Although in the arrangement shown, the head of liquid 26 between the trap 25 and generator 1 is sufficient to prevent backward flow of the vapor of said liquid in the conduit 28; under some circumstances, I prefer to also include in the apparatus a. check valve 40 to prevent such backward flow, regardless of the head of liquid between the generator 1 and the trap 25.

Although ordinary alcohol may be used as vthe secondary refrigerant aforesaid, I prefer to employ ethyl chloride. However, it

. is to be understood that any suitable material may be employed which is liquefi'able and that various modifications may be made therein without departing from the essential features of my invention as defined in the appended claims.

I claim:

1. In a refrigerating system of the absorption type; the combination with a main refrigerating apparatus inclosing a primary refrigerant and including a generator, a con'- denser and an evaporator, connected in a closed conduit circuit, means adapted to intermittently heat said generator, and thermostatic means adapted to automatically control said heating means in accordance with the temperature of said primary refrigerant; of means adapted to intermittently cool said generator, including a secondary closed conduit circuit with a liquid trap, and a cellular radiator including air passageways and separate adjoining passageways containing a secondary refrigerant, capable of boiling at a lower temperature than said primary refrigerant; said secondary conduit circuit extending in and out of said generator; means adapted to induce air flow through said radiator, including a stack open to the atmosphere; a valve in said secondary circuit, between said trap and said generator; where- .by,fwhen said valve is closed, the sec/ondary refrigerant, in a liquid state, may be excluded from the portion of its circuit extending in said generator; and means operatively connecting said heater and valve, whereby they are rendered alternately operative by said thermostatic means.

2. In a refrigerating system of the absorption type; the combination with a main refrigerating apparatus inclosing a primary refrigerant and including a generator, a condenser and an evaporator, connected in a closed conduit circuit,` and means adapted to intermittently heat said generator; of means adapted to intermittently cool said generator, including a secondary closed conduit circuit with a liquid trap, and a radiator including air passageways and separate adjoining passageways containing a secondary refrigerant, capable of boiling at a lower temperature than said primary refrigerant; said secondary conduit circuit extending in and out of said generator; means adapted to induce air flow through vsaid radiator; a valve in said secondary circuit, between said trap and said generator; whereby, when said valve is closed, the secondary refrigerant, in a liquid state, may be excluded from the portion of its circuit extending in said generator; thermostatic means including a valve adapted to be operated by the changes in temperature at said generator; and means operativelyyconnecting said heater and valve, whereby they are rendered alternately operative, by said thermostatic means.

3. In a refrigerating system of the absorption type; the combination with a primary refrigerating apparatus including a generator, means adapted to intermittently heat said generator, and thermostatic means adapted to automatically control said heating means in accordance with the temperature of the primary refrigerant; of means adapted to intermittently cool said generator, including a liquid trap and a radiator including air passageways and separate adjoining passageways containing a secondary refrigerant, capable of boiling at a lower temperature than said primary refrigerant; said secondary conduit extending in and out of said generator; means adapted to induce air flow through said radiator; a valve in said secondary conduit, between said trap and said generator; whereby, when said valve is closed, the secondary refirgerant, in a liquid state, may be prevented from extending in said generator; and connecting means whereby said heater and valve are rendered alternately operative.

4. In a refrigerating system of the absorption type; the combination with a primary refrigerating apparatus inclosing a primary refrigerant and including a generator, means adapted to intermittently heat said generator, and thermostatic means adapted to automatically control said heating means; of means adapted to intermittently cool said generator, including a liquid trap and a radiator including air passageways and separate adjoining passageways containing a secondary refrigerant; said secondary conduit extending in and out of said generator; means adapted to induce air iow through said radiator; a valve in said secondary conduit, between said trap and said generator; whereby, when said valve is closed, the secondary refrigerant; in a liquid state, may be excluded from extending in said generator; and means whereby said heater and valve are rendered alternately operative.

In testimony whereof, I have hereunto signed my name at Conshohocken, Pennsylvania, this fourth day of June, 1929.

ARCHIE HUGH STRONG. 

